In terms of sheer quality the down filling for this duvet is absolutely exceptional. Sourced from one of the finest mountain environments in Europe, the Pyrenees, where the down clusters are large and fluffy due to the cold temperature climate. The fill power of the pure duck down is a remarkable 750 - this means the filling in your duvet is soft, light, warm and incredibly lofty. The duvet is manufactured to the highest specification - a down-proof, pure cotton cambric casing contains individual cassette box pockets. This keeps the filling evenly distributed, eliminating any cold spots for a luxurious drape. The 10.5 tog is suitable for autumn weather and even through the winter season in a well-insulated bedroom. Conforms to European Standard EN12934.